ligerUI ComboBox多级菜单无刷新联动

//ligerUI ComboBox多级菜单联动 
//此例菜单共六级
	   //定义全局变量,保存菜单所选中的值
            var university = null, college = null, major = null, grade = null, level = null, classes = null;

            $("#ofUniversity").ligerComboBox({                     
                url: "" + 'student/student_getAllUniversity/',  
                valueFieldID: 'chooceUniversity', 
                valueField:"id",
                textField:"name",
                onSelected: function (uni) {
                 //uni为第一级菜单所选中的值
		 // 通过ajax发送请求,加载下一个菜单数据
                    $.ajax({
			//默认为get方法传参
                        url: '' + 'student/student_getCollege',
                        data: {
                            uni: uni
                        },
                        success: function(data){
			    //解析返回的json数据
                            data = eval('(' + data + ')');
                            university = null;
                            college = null;
                            major = null;
                            grade = null;
                            level = null;
                            classes = null;
			   //初始化菜单数据
                            liger.get('ofCollege').setData(data);//加载下一个菜单数据
                            liger.get('ofMajor').setData([{}]);
                            liger.get('ofGrade').setData([{}]);
                            liger.get('ofLevel').setData([{}]);
                            liger.get('ofClass').setData([{}]);
                            university = uni;
                        }
                    });
                },
                onButtonClick: function () {
                    classes = null;
                }
            });

            $("#ofCollege").ligerComboBox({
                data: null,
                valueFieldID: 'chooceCollege', 
                valueField:"id",
                textField:"name",

                onSelected: function (col) {
                    if (university)
                    {
                        $.ajax({
                            url: '' + 'student/student_getMajor',
                            data: {
                                college: col
                            },
                            success: function(data){
                                data = eval('(' + data + ')');
                                college = null;
                                major = null;
                                grade = null;
                                level = null;
                                classes = null;
                                liger.get('ofMajor').valueField.val("");
                                liger.get('ofMajor').setData(data);
                                liger.get('ofGrade').setData([{}]);
                                liger.get('ofLevel').setData([{}]);
                                liger.get('ofClass').setData([{}]);
                                college = col;
                            }
                        });
                    }
                },
                onButtonClick: function () {
                    classes = null;
                }
            });

            $("#ofMajor").ligerComboBox({  
                data: null,                     
                valueFieldID: 'chooceMajor', 
                valueField:"id",
                textField:"name",

                onSelected: function (maj) {
                    if (college)
                    {
                        $.ajax({
                            url: '' + 'student/student_getGrade',
                            data: {
                                uni: university,
                                college: college,
                                major: maj
                            },
                            success: function(data){
                                data = eval('(' + data + ')');
                                major = null;
                                grade = null;
                                level = null;
                                classes = null;
                                liger.get('ofGrade').valueField.val("");
                                liger.get('ofGrade').setData(data);
                                liger.get('ofLevel').setData([{}]);
                                liger.get('ofClass').setData([{}]);
                                major = maj;
                            }
                        });
                    }
                },
                onButtonClick: function () {
                    classes = null;
                }
            });

            $("#ofGrade").ligerComboBox({   
                data: null,                    
                valueFieldID: 'chooceGrade', 
                valueField:"id",
                textField:"name",
                    
                onSelected: function (gra) {
                    if (major)
                    {
                        $.ajax({
                            url: '' + 'student/student_getLevel',
                            data: {
                                uni: university,
                                college: college,
                                major: major,
                                grade: gra
                            },
                            success: function(data){
                                data = eval('(' + data + ')');
                                grade = null;
                                level = null;
                                classes = null;
                                liger.get('ofLevel').valueField.val("");
                                liger.get('ofLevel').setData(data);
                                liger.get('ofClass').setData([{}]);
                                grade = gra;
                            }
                        });
                    }
                },
                onButtonClick: function () {
                    classes = null;
                }
            });

            $("#ofLevel").ligerComboBox({     
                data: null,                  
                valueFieldID: 'chooceLevel', 
                valueField:"id",
                textField:"name",

                onSelected: function (lev) {
                    if (grade)
                    {
                        $.ajax({
                            url: '' + 'student/student_getClass',
                            data: {
                                uni: university,
                                college: college,
                                major: major,
                                grade: grade,
                                level: lev
                            },
                            success: function(data){
                                data = eval('(' + data + ')');
                                level = null;
                                classes = null;
                                liger.get('ofClass').setData(data);
                                level = lev;
                            }
                        });
                    }
                },
                onButtonClick: function () {
                    classes = null;
                }
            });

            $("#ofClass").ligerComboBox({     
                data: null,                 
                valueFieldID: 'chooceClass', 
                valueField:"id",
                textField:"name",

                onSelected: function (cla) {      
                    if (!cla && !classes) return;
                    manager = window['g'] = $("#maingrid").ligerGrid({
                        height:'98%',
                        columns: [
                        { display: '账号', name: 'account', minWidth: 180 ,editor: { type: 'text' }},
                        { display: '姓名', name: 'name', minWidth: 180 ,editor: { type: 'text' }},
                        { display: '性别', name: 'gender', minWidth: 180 ,editor: { type: 'text' }},
                        { display: '联系电话', name: 'phone', minWidth: 180 ,editor: { type: 'text' }},
                        { display: '所属大学', name: 'ofUniversity',  minWidth: 60 ,
                            editor: {type:'select', data:universityList, valueColumnName:'id', displayColumnName:'name'},

                            render: function (item)
                            {
                                for(var i = 0; i < universityList.length; i++) {
                                    if (universityList[i]['id'] == item.ofUniversity)
                                        return universityList[i]['name'];
                                }
                            }
                         },

                         { display: '详细', name: 'post',  minWidth: 60 ,render: function (rowdata, rowindex, value)
                             {
                                 var h = '详细  ';
                                  return h;
                             }
                         },
                         { display: '操作', isSort: false, width: 180, render: function (rowdata, rowindex, value)
                             {
                                 var  h = '密码重置  ';
                                 h += '删除  ';
                                 return h;
                             }
                             }
                        ],
                        toolbar: { items: [
                        { text: '增加', click: addNewRow, img: 'LigerUI/lib/ligerUI/skins/icons/add.gif' },
                        ]},
                        method:'POST',
                        async: 'true',
                        enabledEdit: false,
                        clickToEdit: false,
                        dataType: 'server',
                        dataAction: 'server', 
                        url: SITE_URL +"student/student_loadStuInfo?uni="+university+'&major='+major+'&grade='+grade+'&level='+level+'&class='+cla+'&college='+college,
                        pageSize: 15 ,
                        rownumbers: true,
                        pageSizeOptions:[15, 30, 45], 
                        width: '99.6%'
                    });
                }
            });
        });
OK, we done!

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